error[E02004]: invalid 'module' declaration
  ┌─ tests/move_check/dependencies/multiple_friend_cycles.move:8:5
  │
4 │     friend 0x2::B;
  │     -------------- '0x2::B' is a friend of '0x2::A'
  ·
8 │     friend 0x2::A;
  │     ^^^^^^^^^^^^^^ '0x2::A' is a friend of '0x2::B'. This 'friend' relationship creates a dependency cycle.